Jeff asked Steve Trammell how many flights he had on his rocket when the new F32's came out I gave him a demo motor at the time. Jack G ----- Original Message ----- From: Chris J Kobel<mailto:Chris.J.Kobel@xxxxxxxx> To: roc-chat@xxxxxxxxxxxxx<mailto:roc-chat@xxxxxxxxxxxxx> Sent: Sunday, May 08, 2011 8:08 PM Subject: [roc-chat] Re: Speed of Balsa Jeff, I've had several successful flights of my Estes Goblin on F39s, which sim out at 563 mph (~825 ft/s) and 41g. She's still flying with over 16 flights logged since 1999. It has four short span, trapezoidal shaped 1/8" balsa fins surface attached and heavily filleted with white glue circa ~ 1974. Chris Kobel From: Jeff Gortatowsky <indanapt@xxxxxxxxx> To: roc <roc-chat@xxxxxxxxxxxxx> Date: 05/08/2011 05:53 PM Subject: [roc-chat] Speed of Balsa Sent by: roc-chat-bounce@xxxxxxxxxxxxx ------------------------------------------------------------------------------ I know is a 'generalization' and there are many variables... but in general any know what sort of acceleration or velocity makes one say, "Okay, 1/8 inch surface mounted fins are gonna shred." I realize the planform makes a big difference because of flutter. Just curious because I been simulating some of my paper and balsa 24mm MMT rockets using the newly cert'd CTI 24mm loads. The F240VM gets into the 800ft/sec range! (For comparison an D15 is 230 and an E28 is about 450 ft/sec) --------------------------------------- Jeff Gortatowsky, Redondo Beach, CA | Twitter: JeffGortatowsky | Yahoo: indanapt Facebook: http://www.facebook.com/jeffgortatowsky<http://www.facebook.com/jeffgortatowsky> "(Scientific) Skepticism is not a set of beliefs, it is a set of methods for asking questions about reality." -- Doctor Steven Novella